Mechanism for transforming continuous rotary motion into reciprocating motion



MOTION INTO RECIPROCATING MOTION Filed Feb. 21, 1949 v U. PIANTA ET AL MECHANISM FOR TRANSFORMING CONTINUOUS ROTARY Sept. 19, 1950 Patented Sept. 19, 1950 MECHANISM FOR. TRANSFORMING CON- TINUOUS ROTARY MOTION INTO RECIP- ROCATING BIOTION Ubaldo Pianta, Milan,

Brescia, Italy, assignors to Societa Italiana Ernesto Breda Per Costruzioni Meccaniche,

Milan, Italy, a firm and Sestilio Fiorini,

Application February 21, 1949, Serial No. 77,656 In Italy March 18, 1948 2 Claims. (CI. 74-37) The present invention relates to a mechanism, by means of which a continuous rotary motion, which may be a uniform motion, can be used as a drive for a rectilinear reciprocating motion interrupted by long lasting rest periods at the end of each stroke. Devices of that kind may find application in several machines and are particularly useful for straight bar knitting machines, with special reference to those for stockings and the like of the Cotton type, which need. a long lasting stage at nul velocity at the inversion points of the reciprocating movement.

The accompanying drawing represents by way of example and without limiting the scope of the invention, one embodiment of the mechanism, which may be put into practice in several forms without departing from the scope of the invention.

Figures I, II, and III represent the front view, the cross-section and a perspective view respectively of the mechanism.

As it appears from the drawing, the mechanism comprises two continuous chains numbered I and 2, winding on the sprockets 3, l, 5 and 5. l and 5 are the driving sprockets and receive motion from the shafts l and 5 by means of the pinions 9, I 5 and H, l2. .As clearly appears from the drawing, the driving sprockets 4 and 5 turn in opposite relative directions. On the chains I and 2 there are hinged the connecting rods l5 and it by means of the pins 13 and Hi. The rods I5 and I 6 are hinged to each other by means of the pin I? which is rigidly connected to the slide I 8 sliding on the guide l9. Therods l5 and I5 have a length equal to the radius of the sprockets 3, 4, 5 and 6, which are all equal to one another in diameter. The sprockets 3 and 5 are loose on their journals.

The operation of the above mechanism is evidently as follows:

The driving shaft 24 rotates the shafts and 8, by means of the pinions 9, I and II, l2, with opposite directions and, therefore, also the driving sprockets 6 and 4, which transmit the continuous motion to the chains l and 2. These chains will evidently move in opposite directions relative to each other. The sprockets and 3 are loose.

As the chains move in opposed directions, they drag in a concurrent direction the slide l8 sliding on the guide l9 (owing to the connection of the rods as clearly shown in the drawing). If the centre of the pin I! coincides (at the end of a stroke) with the centre of the axis of the sprockets dragging the chain, the slide l8 will remain at nul velocity for a period corresponding to the rotation of the rods along the are through which the chains engage the driving or driven sprockets (3, 4, 5 and 6) such arc being In order to prevent variations of movement due to the flexibility of the chains, the mechanism is provided with guides 22 and 23 in which there are sliding rolls 2!! and 2| mounted on pins 13 and M of the rods l5 and I6.

oted on said member and having an effective length equal to the radius of said sprockets, the freeends of said connecting rods being hinged to the said two chains respectively by two hinges which in theirmovement simultaneously intersect the plane of the said axes.

2. A device according to claim 1, comprising guide means for said hinges.

UBALDO PIANTA. SESTILIO FIORINI.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Name Date Hunter April 29, 1930 Number 

